MESON Chess Problem Database

Problem Display
PID: 23207 (8/8/4Q3/8/8/1K5n/3p2R1/3k2r1 w - - 0 1)

Lincoln, Robert A

Fun with Chess Miniatures, 1996

8/8/4Q3/8/8/1K5n/3p2R1/3k2r1

#2

3 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Sf2
      • 2.Rxg1#
    • 1...Sf4
      • 2.Rxg1#
    • 1...Sg5
      • 2.Rxg1#
  • Tries
    • 1.Kb2?
      • threat
        • 2.Qe2#
      • 1...Re1
        • 2.Qb3#
      • 1...Sf2
        • 2.Rxg1#
      • 1...Sf4
        • 2.Rxg1#
      • 1...Rxg2!
    • 1.Qc4?
      • 1...Ke1
        • 2.Qe2#
      • 1...Rxg2
        • 2.Qf1#
      • 1...Re1
        • 2.Qc2#
      • 1...Rf1
        • 2.Qxf1#
      • 1...Sf2
        • 2.Rxg1#
      • 1...Sf4
        • 2.Rxg1#
      • 1...Sg5
        • 2.Rxg1#
      • 1...Rh1!
    • 1.Qg4+?
      • 1...Ke1
        • 2.Qe2#
      • 1...Kc1!
    • 1.Qe4?
      • threat
        • 2.Qb1#
      • 1...Kc1
        • 2.Qc2#
      • 1...Sf2
        • 2.Rxg1#
      • 1...Rxg2!
    • 1.Qe5?
      • threat
        • 2.Qa1#
      • 1...Kc1
        • 2.Qa1#
      • 1...Sf2
        • 2.Rxg1#
      • 1...Rxg2!
  • Keys
    • 1.Qa6!
      • threat
        • 2.Qa1#
      • 1...Kc1
        • 2.Qa1#
      • 1...Ke1
        • 2.Qe2#
      • 1...Rxg2
        • 2.Qf1#
      • 1...Sf2
        • 2.Rxg1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • S(d);N_GUARD::R(A),XR(b)
  • Tries
    • Try
      • K(B);P-FLIGHT
      • Threat
        • QAB1(C)
      • Vars
        • R(b);SBLOCK::QAB(C)
        • S(d);N_GUARD::R(A),XR(b)
      • Refutation
        • R(b);XR(A)
    • Try
      • Q(C);
      • Vars
        • K(a);P-FLIGHT::QAR1(C)
        • R(b);N_GUARD,XR(A)::QAR2(C)
        • R(b);SBLOCK::QAB1(C)
        • R(b);N_GUARD::QAR2(C),XR(b)
        • S(d);N_GUARD::R(A),XR(b)
      • Refutation
        • R(b);
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(C);
      • Threat
        • QAR2(C)
      • Vars
        • K(a);P-FLIGHT::QAR1(C)
        • S(d);N_GUARD::R(A),XR(b)
      • Refutation
        • R(b);XR(A)
    • Try
      • Q(C);
      • Threat
        • QAR(C)
      • Vars
        • K(a);P-FLIGHT::QAR2(C)
        • S(d);N_GUARD::R(A),XR(b)
      • Refutation
        • R(b);XR(A)
  • Actual
    • Q(C);
    • Threat
      • QAR(C)
    • Vars
      • K(a);P-FLIGHT::QAR2(C)
      • K(a);P-FLIGHT::QAR1(C)
      • R(b);N_GUARD,XR(A)::QAR2(C)
      • S(d);N_GUARD::R(A),XR(b)
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